[LTP] min_free_kbytes: Handle transient memory drops in check_monitor

[linuxtestproject.agent@gmail.com]

Hi Wei,

On Tue May 26 08:36:47 2026 +0000, Wei Gao wrote:
> min_free_kbytes: Handle transient memory drops in check_monitor

>  	struct sigaction sa;
>  
> +	end = 0;
> +

Good catch for multi-iteration support.

> -		sleep(2);
> +		usleep(100000);

Changing from 2s to 100ms makes the monitor much more responsive.

> +		for (i = 1; i < 1024; i *= 2) {
> +			usleep(i * 1000);
> +			memfree = SAFE_READ_MEMINFO("MemFree:");
> +			if (memfree >= tune)
> +				break;
> +		}

The exponential backoff is a good approach. Total wait time is ~1023ms
(1+2+4+8+16+32+64+128+256+512), matching the commit message.

All good. Approved.

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